I have never taken a blue dye test.
I'm not sure about a false positive, but when I was pregnant with DD I dropped the stick in the toilet and it still came out positive. However, I took one just the other day that I thinkwas defective because the result (control or otherwise) didn't appear until the 12-13 minute mark (and it was an expensive brand!). When that happens you don't know if you can test it! I'll be staying away from them!
I had a false positive on a blue test (life brand from shoppers drugmart), two hours later I got a negative on FRER. I did 4 tests over the next few days plus a blood test. No doubt about it I was never pregnant. And the line to show I was pregnant came up before the control line.
Sean (38 )
Bailey (April 2, 2011)
"The soul always knows what to do to heal itself. The challenge is to silence the mind." Caroline Myss
Host of Living with Diabetes
I've had bad experiences with blue dye tests, too. I just assumed at the time they were chemical pregancies, but now I wonder if they were just false postivies. I stay away from them now - I try to only use Answer or FRER and wait longer to test (at least 10 or 11 dpo). However, in a bind I might use a pink-dye Dollar Tree test.
~Remembering my father~
*Feb 1931 - Oct 2012*
Just want to comment on the "early chemical pregnancies" thing mentioned. I got my BFP with an equate blue dye dest. I think they ARE more sensitive becuase the same day I also tested with an FRER and $store test, both pink dye tests. NO BFP or even faint lines on those, but the blue dye test was as BRIGHT and clear as day. I personally think they are more sensitive then the pink dye tests.
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I took an Equate test from walmart(pink lines) no line in the control window for 6 hours, in the directions it states that if no line shows within 5 minutes the test is invalid, the line in the + or - window is gone today and the control window line is very dark, so I am unsure if this was a dud test..
Last edited by rottielover; 10-20-2009 at 02:15 PM.
1. the line is very thin
2. the line is off center
As far as your pink test goes... if that control line did not show up, then it was definetly a dud and the results cannot be valid!
NOT saying you are not PG sweety, just saying that a pink dye test (Preferrably a FRER, or First Response Early Result) would be a much better test to use! And I would suggest dipping into a cup VS peeing on the stick itself. It is a much more reliable testing method.
Good luck and keep us posted!
I took a HPT with a blue dye test at 12DPO and got a positive then confirmed it with a digital. I think people see a very faint line and assume it's a positive when it needs to be pretty distinct.